| 摘要 |
The invention relates to a device for dosing the administration of an injectable product comprising: a) a housing (1, 5) with a reservoir (2) for the product; b) a piston (3) that pushes out the product from the reservoir (2) when it is displaced towards an outlet (4) of the reservoir (2) in the advance direction; c) a toothed bar (10) with a first row of teeth (11) and a second row of teeth (12) that displaces the piston (3) in the advance direction; d) a drive member (20) that can be displaced in and against the advance direction in relation to the housing (1, 5), which entrains the toothed bar (10) when it is displaced in the advance direction and e) blocki ng means (6) which is not displaceable in relation to the housing (1, 5) and which cooperates with one of the rows of teeth (11, 12) in such a way that i t prevents the displacement of the toothed bar (10) against the advance direction and enables the displacement of the toothed bar (10) in the advanc e direction. The second row of teeth (12) has an elongated tooth space (17a) i n which the blocking means (7) cooperating with the second row of teeth (12) engages when the toothed bar (10) is placed in a starting position before effecting a first administration.
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